package com.atguigu.gulimall.order.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.SeckillOrderTo;
import com.atguigu.common.utils.R;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.order.constant.OrderConstant;
import com.atguigu.gulimall.order.dao.OrderItemDao;
import com.atguigu.gulimall.order.entity.OrderItemEntity;
import com.atguigu.gulimall.order.entity.PaymentInfoEntity;
import com.atguigu.gulimall.order.enume.OrderStatusEnum;
import com.atguigu.gulimall.order.feign.CartFeignService;
import com.atguigu.gulimall.order.feign.MemberFeignService;
import com.atguigu.gulimall.order.feign.ProductFeignService;
import com.atguigu.gulimall.order.feign.WmsFeignService;
import com.atguigu.gulimall.order.interceptor.LoginUserInterceptor;
import com.atguigu.gulimall.order.service.OrderItemService;
import com.atguigu.gulimall.order.service.PaymentInfoService;
import com.atguigu.gulimall.order.to.OrderCreateTo;
import com.atguigu.gulimall.order.vo.*;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import io.seata.spring.annotation.GlobalTransactional;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.util.*;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.order.dao.OrderDao;
import com.atguigu.gulimall.order.entity.OrderEntity;
import com.atguigu.gulimall.order.service.OrderService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;


@Service("orderService")
public class OrderServiceImpl extends ServiceImpl<OrderDao, OrderEntity> implements OrderService {

    private ThreadLocal<OrderSubmitVo> confirmVoThreadLocal = new ThreadLocal<>();

    @Autowired
    private MemberFeignService memberFeignService;

    @Autowired
    private CartFeignService cartFeignService;

    @Autowired
    private ThreadPoolExecutor executor;

    @Autowired
    private WmsFeignService wmsFeignService;

    @Autowired
    private StringRedisTemplate redisTemplate;

    @Autowired
    private ProductFeignService productFeignService;

    @Autowired
    private OrderItemService orderItemService;

    @Autowired
    private RabbitTemplate rabbitTemplate;

    @Autowired
    private PaymentInfoService paymentInfoService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<OrderEntity> page = this.page(
                new Query<OrderEntity>().getPage(params),
                new QueryWrapper<OrderEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public OrderConfirmVo confirmOrder() throws ExecutionException, InterruptedException {

        OrderConfirmVo confirmVo = new OrderConfirmVo();
        MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();
        System.out.println("主线程。。。" + Thread.currentThread().getId());
        // 获取之前的请求
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();

        CompletableFuture<Void> getAddressFuture = CompletableFuture.runAsync(() -> {
            // 1、远程查询所有的收货地址列表
            System.out.println("第一个子线程member。。。" + Thread.currentThread().getId());
            // 每个线程都共享之前的请求数据
            RequestContextHolder.setRequestAttributes(requestAttributes);
            List<MemberAddressVo> address = this.memberFeignService.getAddress(memberRespVo.getId());
            confirmVo.setAddress(address);
        }, executor);

        CompletableFuture<Void> cartFuture = CompletableFuture.runAsync(() -> {
            // 2、远程查询购物车所有选中的购物项
            System.out.println("第二个子线程cart。。。" + Thread.currentThread().getId());
            // 每个线程都共享之前的请求数据
            RequestContextHolder.setRequestAttributes(requestAttributes);
            List<OrderItemVo> items = this.cartFeignService.getCurrentUserCartItems();
            confirmVo.setItems(items);
            // feign在远程调用之前要构造请求，调用很多的拦截器
        }, executor).thenRunAsync(() -> {
            List<OrderItemVo> items = confirmVo.getItems();
            List<Long> collect = items.stream().map(item -> item.getSkuId()).collect(Collectors.toList());
            // TODO: 一定要启动库存服务，否则查不出库存
            R hasStock = this.wmsFeignService.getSkuHasStock(collect);
            List<SkuStockVo> data = hasStock.getData(new TypeReference<List<SkuStockVo>>() {});
            if (data != null) {
                Map<Long, Boolean> map = data.stream().collect(Collectors.toMap(SkuStockVo::getSkuId, SkuStockVo::getHasStock));
                confirmVo.setStocks(map);
            }
        }, executor);
        // 3、查用户积分
        Integer integration = memberRespVo.getIntegration();
        confirmVo.setIntegration(integration);
        // 4、其他数据自动计算
        // TODO: 5、防重令牌
        String token = UUID.randomUUID().toString().replace("-", "");
        // 服务器端redis中保存
        this.redisTemplate.opsForValue().set(OrderConstant.USER_ORDER_TOKEN_PREFIX + memberRespVo.getId(), token, 30, TimeUnit.MINUTES);
        // vo中保存返回数据
        confirmVo.setOrderToken(token);

        CompletableFuture.allOf(getAddressFuture, cartFuture).get();

        return confirmVo;
    }

    /**
     * 本地事务，在分布式系统中，只能控制住自己的回滚，控制不了其他服务的回滚
     * 分布式事务：最大原因是网络问题+由于是分布式的机器，操作的不是同一个数据库，控制不了别的数据库的回滚
     * @param vo
     * @return
     */
    @Override
    @Transactional
//    @GlobalTransactional
    public SubmitOrderResponseVo submitOrder(OrderSubmitVo vo) {

        confirmVoThreadLocal.set(vo);

        SubmitOrderResponseVo response = new SubmitOrderResponseVo();

        MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();

        response.setCode(0);

        // 1、验证令牌【令牌的对比和删除一定要保证原子性】
        // 0-令牌失败   1-删除成功
        String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";
        String orderToken = vo.getOrderToken();
        // 原子验证令牌和删除令牌
        Long result = this.redisTemplate.execute(new DefaultRedisScript<Long>(script, Long.class), Arrays.asList(OrderConstant.USER_ORDER_TOKEN_PREFIX + memberRespVo.getId()), orderToken);
        if (result == 0L) {
            // 令牌验证失败
            response.setCode(1);
            return response;
        } else {
            // 令牌验证成功
            // 下单：创建订单，验令牌，验价格，锁库存
            // 1、创建订单、订单项等信息
            OrderCreateTo order = this.createOrder();
            BigDecimal payAmount = order.getOrder().getPayAmount();
            BigDecimal payPrice = vo.getPayPrice();

            if (Math.abs(payAmount.subtract(payPrice).doubleValue()) < 0.01) {
                // 金额比对
                // TODO:3、保存订单
                this.saveOrder(order);
                // 4、库存锁定..只要有异常，回滚订单数据
                // 订单号、所有订单项（skuId\skuName\num）
                WareSkuLockVo lockVo = new WareSkuLockVo();
                lockVo.setOrderSn(order.getOrder().getOrderSn());

                List<OrderItemVo> locks = order.getOrderItems().stream().map(item -> {
                    OrderItemVo itemVo = new OrderItemVo();
                    itemVo.setSkuId(item.getSkuId());
                    itemVo.setCount(item.getSkuQuantity());
                    itemVo.setTitle(item.getSkuName());

                    return itemVo;
                }).collect(Collectors.toList());

                lockVo.setLocks(locks);
                // TODO:远程锁库存
                /**
                 * 为了保证高并发   库存服务自己进行回滚:可以发消息给库存服务；
                 * 库存服务本身也可以使用自动解锁模式————使用消息队列
                 */
                R r = this.wmsFeignService.orderLockStock(lockVo);
                if (r.getCode() == 0) {
                    // 锁库存成功
                    response.setOrder(order.getOrder());
                    // TODO:远程扣减积分  如果出现异常
//                    int i = 10 / 0;     // 这边出现异常，订单会回滚，但是库存操作是通过远程调用的，并没有回滚
                    // TODO:订单创建成功后发送消息给MQ
                    this.rabbitTemplate.convertAndSend("order-event-exchange", "order.create.order", order.getOrder());
                    return response;
                } else {
                    // 锁库存失败
                    String meg = (String) r.get("meg");
                    throw new NoStockException(meg);
                }
            } else {
                response.setCode(2);
                return response;
            }
        }
//        String redisToken = this.redisTemplate.opsForValue().get(OrderConstant.USER_ORDER_TOKEN_PREFIX + memberRespVo.getId());
//
//        if (orderToken != null && orderToken.equals(redisToken)) {
//            // 验证令牌通过
//        } else {
//            // 不通过
//        }
    }

    @Override
    public OrderEntity getOrderByOrderSn(String orderSn) {

        OrderEntity order_sn = this.getOne(new QueryWrapper<OrderEntity>().eq("order_sn", orderSn));
        return order_sn;
    }

    @Override
    public void closeOrder(OrderEntity entity) {
        // 查询当前这个订单的最新状态
        OrderEntity orderEntity = this.getById(entity.getId());
        if (orderEntity.getStatus() == OrderStatusEnum.CREATE_NEW.getCode()) {
            // 关单
            OrderEntity update = new OrderEntity();
            update.setId(entity.getId());
            update.setStatus(OrderStatusEnum.CANCLED.getCode());

            this.updateById(update);

            OrderTo orderTo = new OrderTo();
            BeanUtils.copyProperties(orderEntity, orderTo);
            // 发给MQ一个消息
            try {
                // TODO 保证消息一定会发送出去，每一个消息都可以做好日志记录（给数据库保存每一个消息的详细信息）
                // TODO 定期扫描数据库，将失败的消息再发送一遍
                this.rabbitTemplate.convertAndSend("order-event-exchange", "order.release.other", orderTo);
            } catch (Exception e) {
                // TODO 将没有发送成功的消息进行重试发送
            }
        }
    }

    @Override
    public PayVo getOrderPay(String orderSn) {

        PayVo payVo = new PayVo();

        OrderEntity order = this.getOrderByOrderSn(orderSn);
        BigDecimal bigDecimal = order.getPayAmount().setScale(2, BigDecimal.ROUND_UP);

        payVo.setTotal_amount(bigDecimal.toString());
        payVo.setOut_trade_no(order.getOrderSn());

        List<OrderItemEntity> order_sn = this.orderItemService.list(new QueryWrapper<OrderItemEntity>().eq("order_sn", orderSn));
        OrderItemEntity entity = order_sn.get(0);
        payVo.setSubject(entity.getSkuName());
        payVo.setBody(entity.getSkuAttrsVals());

        return payVo;
    }

    @Override
    public PageUtils queryPageWithItem(Map<String, Object> params) {

        MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();

        IPage<OrderEntity> page = this.page(new Query<OrderEntity>().getPage(params),
                new QueryWrapper<OrderEntity>().eq("member_id", memberRespVo.getId()).orderByDesc("id"));

        List<OrderEntity> order_sn = page.getRecords().stream().map(order -> {
            List<OrderItemEntity> itemEntities = this.orderItemService.list(new QueryWrapper<OrderItemEntity>().eq("order_sn", order.getOrderSn()));
            order.setItemEntities(itemEntities);
            return order;
        }).collect(Collectors.toList());

        page.setRecords(order_sn);

        return new PageUtils(page);
    }

    /**
     * 处理支付宝的支付结果
     * @param vo
     * @return
     */
    @Override
    public String handlePayResult(PayAsyncVo vo) {
        // 1、保存交易流水
        PaymentInfoEntity infoEntity = new PaymentInfoEntity();
        infoEntity.setAlipayTradeNo(vo.getTrade_no());
        infoEntity.setOrderSn(vo.getOut_trade_no());
        infoEntity.setPaymentStatus(vo.getTrade_status());
        infoEntity.setCallbackTime(vo.getNotify_time());

        this.paymentInfoService.save(infoEntity);
        // 2、修改订单的状态信息
        if (vo.getTrade_status().equals("TRADE_SUCCESS") || vo.getTrade_status().equals("TRADE_FINISHED")) {
            // 支付成功状态
            String outTradeNo = vo.getOut_trade_no();
            this.baseMapper.updateOrderStatus(outTradeNo, OrderStatusEnum.PAYED.getCode());
        }
        return "success";
    }

    @Override
    public void createSeckillOrder(SeckillOrderTo seckillOrder) {
        // TODO 保存订单信息
        OrderEntity orderEntity = new OrderEntity();
        orderEntity.setOrderSn(seckillOrder.getOrderSn());
        orderEntity.setMemberId(seckillOrder.getMemberId());

        orderEntity.setStatus(OrderStatusEnum.CREATE_NEW.getCode());

        BigDecimal multiply = seckillOrder.getSeckillPrice().multiply(new BigDecimal("" + seckillOrder.getNum()));
        orderEntity.setPayAmount(multiply);

        this.save(orderEntity);
        // TODO 保存订单项信息
        OrderItemEntity orderItemEntity = new OrderItemEntity();
        orderItemEntity.setOrderSn(seckillOrder.getOrderSn());
        orderItemEntity.setRealAmount(multiply);
        // TODO 获取当前sku的详细信息进行设置
        orderItemEntity.setSkuQuantity(seckillOrder.getNum());

        this.orderItemService.save(orderItemEntity);
    }

    /**
     * 保存订单数据
     * @param order
     */
    private void saveOrder(OrderCreateTo order) {

        OrderEntity orderEntity = order.getOrder();
        orderEntity.setModifyTime(new Date());

        this.save(orderEntity);

        List<OrderItemEntity> orderItems = order.getOrderItems();

        this.orderItemService.saveBatch(orderItems);
    }

    private OrderCreateTo createOrder() {

        OrderCreateTo createTo = new OrderCreateTo();
        // 1、生成订单号
        String orderSn = IdWorker.getTimeId();
        // 创建订单号
        OrderEntity orderEntity = this.buildOrder(orderSn);

        // 2、获取所有的订单项信息
        List<OrderItemEntity> itemEntities = this.buildOrderItems(orderSn);
        // 3、计算价格相关
        this.computePrice(orderEntity, itemEntities);

        createTo.setOrder(orderEntity);
        createTo.setOrderItems(itemEntities);

        return createTo;
    }

    private void computePrice(OrderEntity orderEntity, List<OrderItemEntity> itemEntities) {

        BigDecimal total = new BigDecimal("0.0");
        BigDecimal coupon = new BigDecimal("0.0");
        BigDecimal integration = new BigDecimal("0.0");
        BigDecimal promotion = new BigDecimal("0.0");

        BigDecimal gift = new BigDecimal("0.0");
        BigDecimal growth = new BigDecimal("0.0");
        // 订单的总额，叠加每一个订单项的总额信息
        for (OrderItemEntity entity : itemEntities) {
            coupon = coupon.add(entity.getCouponAmount());
            integration = integration.add(entity.getIntegrationAmount());
            promotion = promotion.add(entity.getPromotionAmount());
            total = total.add(entity.getRealAmount());

            gift = gift.add(new BigDecimal(entity.getGiftIntegration().toString()));
            growth = growth.add(new BigDecimal(entity.getGiftGrowth().toString()));
        }
        // 1、订单价格相关
        orderEntity.setTotalAmount(total);
        // 设置应付总额
        orderEntity.setPayAmount(total.add(orderEntity.getFreightAmount()));
        orderEntity.setCouponAmount(coupon);
        orderEntity.setPromotionAmount(promotion);
        orderEntity.setIntegrationAmount(integration);
        // 设置成长值和积分相关
        orderEntity.setIntegration(gift.intValue());
        orderEntity.setGrowth(growth.intValue());
        // 设置未删除
        orderEntity.setDeleteStatus(0);
    }

    private OrderEntity buildOrder(String orderSn) {

        MemberRespVo respVo = LoginUserInterceptor.loginUser.get();

        OrderEntity entity = new OrderEntity();
        entity.setOrderSn(orderSn);
        entity.setMemberId(respVo.getId());

        OrderSubmitVo submitVo = confirmVoThreadLocal.get();
        // 获取收货地址信息
        R fare = this.wmsFeignService.getFare(submitVo.getAddrId());
        FareVo fareResp = fare.getData(new TypeReference<FareVo>() {});
        // 设置运费信息
        entity.setFreightAmount(fareResp.getFare());
        // 设置收货人信息
        entity.setReceiverCity(fareResp.getAddress().getCity());
        entity.setReceiverDetailAddress(fareResp.getAddress().getDetailAddress());
        entity.setReceiverName(fareResp.getAddress().getName());
        entity.setReceiverPhone(fareResp.getAddress().getPhone());
        entity.setReceiverPostCode(fareResp.getAddress().getPostCode());
        entity.setReceiverProvince(fareResp.getAddress().getProvince());
        entity.setReceiverRegion(fareResp.getAddress().getRegion());
        // 设置订单的相关状态信息
        entity.setStatus(OrderStatusEnum.CREATE_NEW.getCode());
        entity.setAutoConfirmDay(7);

        return entity;
    }

    /**
     * 构建所有订单项数据
     * @return
     */
    private List<OrderItemEntity> buildOrderItems(String orderSn) {
        // 最后确认每个订单项的价格
        List<OrderItemVo> currentUserCartItems = this.cartFeignService.getCurrentUserCartItems();

        if (currentUserCartItems != null && currentUserCartItems.size() > 0) {
            List<OrderItemEntity> itemEntities = currentUserCartItems.stream().map(cartItem -> {
                OrderItemEntity itemEntity = this.buildOrderItem(cartItem);
                itemEntity.setOrderSn(orderSn);

                return itemEntity;
            }).collect(Collectors.toList());

            return itemEntities;
        }
        return null;
    }

    /**
     * 构建某一个指定的订单项
     * @param cartItem
     * @return
     */
    private OrderItemEntity buildOrderItem(OrderItemVo cartItem) {

        OrderItemEntity itemEntity = new OrderItemEntity();
        // 1、订单信息：订单号
        // 2、商品的SPU信息
        Long skuId = cartItem.getSkuId();

        R r = this.productFeignService.getSpuInfoBySkuId(skuId);
        SpuInfoVo data = r.getData(new TypeReference<SpuInfoVo>() {});

        itemEntity.setSpuId(data.getId());
        itemEntity.setSpuBrand(data.getBrandId().toString());
        itemEntity.setSpuName(data.getSpuName());
        itemEntity.setCategoryId(data.getCatalogId());
        // 3、商品的sku信息
        itemEntity.setSkuId(cartItem.getSkuId());
        itemEntity.setSkuName(cartItem.getTitle());
        itemEntity.setSkuPic(cartItem.getImage());
        itemEntity.setSkuPrice(cartItem.getPrice());

        String skuAttr = StringUtils.collectionToDelimitedString(cartItem.getSkuAttr(), ";");
        itemEntity.setSkuAttrsVals(skuAttr);
        itemEntity.setSkuQuantity(cartItem.getCount());
        // 4、优惠信息，这边不设置
        // 5、积分信息
        itemEntity.setGiftGrowth(cartItem.getPrice().multiply(new BigDecimal(cartItem.getCount().toString())).intValue());
        itemEntity.setGiftIntegration(cartItem.getPrice().multiply(new BigDecimal(cartItem.getCount().toString())).intValue());
        // 6、订单项的价格信息
        itemEntity.setPromotionAmount(new BigDecimal("0"));
        itemEntity.setCouponAmount(new BigDecimal("0"));
        itemEntity.setIntegrationAmount(new BigDecimal("0"));
        // 当前订单项的实际金额
        BigDecimal origin = itemEntity.getSkuPrice().multiply(new BigDecimal(itemEntity.getSkuQuantity()));
        BigDecimal subtract = origin.subtract(itemEntity.getCouponAmount()).subtract(itemEntity.getPromotionAmount()).subtract(itemEntity.getIntegrationAmount());
        itemEntity.setRealAmount(subtract);

        return itemEntity;
    }

}